Hydroxyapophyllite Feldspar and can make for interesting

and can make for interesting pieces to cut open

I call this one the "big boi

This material has the tendency to be crumbly

This large specimen is one of my favorites of the Erongo black tourmaline

This specimen is a thin crust of ferrous (iron-based) matrix with dusty red oxidation on the back

Hydroxyapophyllite Feldspar and can make for interestingLocale: N'Chwaning II Mine, South Africa Approx dimensions: 2. 25 x 1. 5 x . 75" Approx weight: 47g This specimen features hydroxyapophyllite crystals with lizardite and calcite on matrix. Properly called "hydroxyapophyllite (K)," hydroxyapophyllite is a variety of apophyllite that is typically colorless. It more frequently grows cubic crystals, but these specimens from the renowned N'Chwaning Mines region form tabular square crystals similar to